He’s an unwitting murder accomplice. He has tasted human flesh. And he is being kept alive at least until a forensic impression can be made of his teeth.

Bones the pit bull (pictured) — allegedly used as a weapon by his junkie owner during a fatal, E. 62nd Street argument last month — may be a four-legged crime scene, but he’s actually the sweetest dog, say law enforcement sources.

“He had a horrible owner, but he’s a wonderful dog,” one source said yesterday after the murder arraignment of Bones’ owner, Shaun Dyer, accused of bludgeoning and siccing the dog on his E. 62nd St. roommate David Shadha.

“He’s just as happy as can be,” in his cage at Animal Care and Control, where he has been since the murder, the source said.

Dyer pleaded not guilty in Manhattan Supreme Court yesterday as prosecutors announced they would be seeking forensic canine teeth impressions from dog.

In addition to the blow to the head — likely with a metal pipe – that killed him, Shadha had bite marks on his body, prosecutor Coleen Balbert said in court. The terrified victim had managed to make a 911 call prior to his death, in which he told the operator that his roommate was making the dog attack.

The body also had what appeared to be additional, week-old dog bites, Balbert said.

Officials believe Dyer may have used his dog as a weapon in a history of violent fights with the roommate. Bones was still at the scene after the murder — a white dog smeared in so much blood that a cop asked Dyer, “Is your dog normally that color…Why is he pinkish in color?”

Bones was swabbed for blood after the incident, according to court documents. It is not clear when his dental impressions will be taken, and what his fate will be afterward.